ohair@286: /*
alanb@368:  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
ohair@286:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
ohair@286:  *
ohair@286:  * This code is free software; you can redistribute it and/or modify it
ohair@286:  * under the terms of the GNU General Public License version 2 only, as
ohair@286:  * published by the Free Software Foundation.  Oracle designates this
ohair@286:  * particular file as subject to the "Classpath" exception as provided
ohair@286:  * by Oracle in the LICENSE file that accompanied this code.
ohair@286:  *
ohair@286:  * This code is distributed in the hope that it will be useful, but WITHOUT
ohair@286:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
ohair@286:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
ohair@286:  * version 2 for more details (a copy is included in the LICENSE file that
ohair@286:  * accompanied this code).
ohair@286:  *
ohair@286:  * You should have received a copy of the GNU General Public License version
ohair@286:  * 2 along with this work; if not, write to the Free Software Foundation,
ohair@286:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
ohair@286:  *
ohair@286:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
ohair@286:  * or visit www.oracle.com if you need additional information or have any
ohair@286:  * questions.
ohair@286:  */
ohair@286: 
ohair@286: package com.sun.xml.internal.org.jvnet.mimepull;
ohair@286: 
ohair@286: import java.io.*;
ohair@286: 
ohair@286: /**
ohair@286:  * Use {@link RandomAccessFile} for concurrent access of read
ohair@286:  * and write partial part's content.
ohair@286:  *
ohair@286:  * @author Kohsuke Kawaguchi
ohair@286:  * @author Jitendra Kotamraju
ohair@286:  */
ohair@286: final class DataFile {
ohair@286:     private WeakDataFile weak;
ohair@286:     private long writePointer;
ohair@286: 
ohair@286:     DataFile(File file) {
ohair@286:         writePointer=0;
ohair@286:         weak = new WeakDataFile(this, file);
ohair@286:     }
ohair@286: 
ohair@286:     /**
ohair@286:      *
ohair@286:      */
ohair@286:     void close() {
ohair@286:         weak.close();
ohair@286:     }
ohair@286: 
ohair@286:     /**
ohair@286:      * Read data from the given file pointer position.
ohair@286:      *
ohair@286:      * @param pointer read position
ohair@286:      * @param buf that needs to be filled
ohair@286:      * @param offset the start offset of the data.
ohair@286:      * @param length of data that needs to be read
ohair@286:      */
ohair@286:     synchronized void read(long pointer, byte[] buf, int offset, int length ) {
ohair@286:         weak.read(pointer, buf, offset, length);
ohair@286:     }
ohair@286: 
ohair@286:     void renameTo(File f) {
ohair@286:         weak.renameTo(f);
ohair@286:     }
ohair@286: 
ohair@286:     /**
ohair@286:      * Write data to the file
ohair@286:      *
ohair@286:      * @param data that needs to written to a file
ohair@286:      * @param offset start offset in the data
ohair@286:      * @param length no bytes to write
ohair@286:      * @return file pointer before the write operation(or at which the
ohair@286:      *         data is written)
ohair@286:      */
ohair@286:     synchronized long writeTo(byte[] data, int offset, int length) {
ohair@286:         long temp = writePointer;
ohair@286:         writePointer = weak.writeTo(writePointer, data, offset, length);
ohair@286:         return temp;
ohair@286:     }
ohair@286: 
ohair@286: }